Smartcam is an open source utility that will turn a bluetooth-enabled Symbian Series 60 camera phone into a webcam that you can use on your Windows PC. Half of the application runs on the phone, reads from the camera and sends video frames to the PC via bluetooth. The other half of the application runs in Windows, receives the video frames and creates a virtual web camera that can be used in programs like Skype or Yahoo messenger.

There’s not much documentation, and the project is still alpha, but if you can grep the source, you technically have everything you need to make other applications which pull live video from the phone.